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Reports <code>StringTokenizer()</code> constructor calls or  <code>nextToken()</code> method calls that
contain duplicate characters in the delimiter argument.
<p><b>Example:</b></p>
<pre><code>
  void printTokens(String text) {
    StringTokenizer tokenizer = new StringTokenizer(text, "\n\n");
    while (tokenizer.hasMoreTokens()) {
      System.out.println(tokenizer.nextToken());
    }
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  void printTokens(String text) {
    StringTokenizer tokenizer = new StringTokenizer(text, "\n");
    while (tokenizer.hasMoreTokens()) {
      System.out.println(tokenizer.nextToken());
    }
  }
</code></pre>
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